In-game description

Those who linger too long on the brink of the Deep will often slip. Dorhys is sure to have wallowed in this darkness, intoxicated by its peril.

Effect

Summons a large projectile-like swarm of insects to ravage an enemy, inflicting both ??? damage and Bleed.

Acquisition

Found behind an illusory wall in Irithyll of the Boreal Valley: From the Church of Yorshka bonfire, leave through the front entrance of the church. Go down the stairs and turn right, ahead of you will be a short staircase leading up to a dead-end. The fence on the right of this viewing deck is an illusory wall that also reveals a staircase leading downward. Continue down the stairs, past the hiding Pontiff Knight, and towards a Cathedral Evangelist guarding an item in the jail down below. Hop into this jail and slay the Evangelist to acquire the miracle.